/*
* Copyright (c) Microsoft Corporation. All rights reserved.
* Copyright (c) 2023 Huawei Device Co., Ltd.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file has been modified by Huawei to verify type inference by adding verification statements.
*/

// === tests/cases/conformance/types/stringLiteral/stringLiteralTypesInUnionTypes04.ts ===
declare function AssertType(value:any, type:string):void;
type T = "" | "foo";

let x: T = undefined;
AssertType(x, "T");
AssertType(undefined, "undefined");

let y: T = undefined;
AssertType(y, "T");
AssertType(undefined, "undefined");

if (x === "") {
    let a = x;
AssertType(a, "string");
AssertType(x, "string");
}

if (x !== "") {
    let b = x;
AssertType(b, "string");
AssertType(x, "string");
}

if (x == "") {
    let c = x;
AssertType(c, "string");
AssertType(x, "string");
}

if (x != "") {
    let d = x;
AssertType(d, "string");
AssertType(x, "string");
}

if (x) {
    let e = x;
AssertType(e, "string");
AssertType(x, "string");
}

if (!x) {
    let f = x;
AssertType(f, "T");
AssertType(x, "T");
}

if (!!x) {
    let g = x;
AssertType(g, "string");
AssertType(x, "string");
}

if (!!!x) {
    let h = x;
AssertType(h, "T");
AssertType(x, "T");
}

